diff --git a/src/borg/crypto/key.py b/src/borg/crypto/key.py
index ab8116591b5..3691051b0a3 100644
--- a/src/borg/crypto/key.py
+++ b/src/borg/crypto/key.py
@@ -383,7 +383,9 @@ def init_ciphers(self, manifest_data=None):
         self.nonce_manager = NonceManager(self.repository, nonce)
 
 
-class FlexiKeyBase:
+class FlexiKey:
+    FILE_ID = 'BORG_KEY'
+
     @classmethod
     def detect(cls, repository, manifest_data):
         key = cls(repository)
@@ -406,12 +408,6 @@ def detect(cls, repository, manifest_data):
         key._passphrase = passphrase
         return key
 
-    def find_key(self):
-        raise NotImplementedError
-
-    def load(self, target, passphrase):
-        raise NotImplementedError
-
     def _load(self, key_data, passphrase):
         cdata = a2b_base64(key_data)
         data = self.decrypt_key_file(cdata, passphrase)
@@ -489,16 +485,6 @@ def create(cls, repository, args):
         logger.info('Keep this key safe. Your data will be inaccessible without it.')
         return key
 
-    def save(self, target, passphrase, create=False):
-        raise NotImplementedError
-
-    def get_new_target(self, args):
-        raise NotImplementedError
-
-
-class FlexiKey(FlexiKeyBase):
-    FILE_ID = 'BORG_KEY'
-
     def sanity_check(self, filename, id):
         file_id = self.FILE_ID.encode() + b' '
         repo_id = hexlify(id)
diff --git a/src/borg/testsuite/archiver.py b/src/borg/testsuite/archiver.py
index 88181c31e18..62a33fb898b 100644
--- a/src/borg/testsuite/archiver.py
+++ b/src/borg/testsuite/archiver.py
@@ -36,7 +36,7 @@
 from ..chunker import has_seek_hole
 from ..constants import *  # NOQA
 from ..crypto.low_level import bytes_to_long, num_cipher_blocks
-from ..crypto.key import FlexiKeyBase, RepoKey, KeyfileKey, Passphrase, TAMRequiredError
+from ..crypto.key import FlexiKey, RepoKey, KeyfileKey, Passphrase, TAMRequiredError
 from ..crypto.keymanager import RepoIdMismatch, NotABorgKeyFile
 from ..crypto.file_integrity import FileIntegrityError
 from ..helpers import Location, get_security_dir
@@ -2882,7 +2882,7 @@ def test_init_interrupt(self):
         def raise_eof(*args):
             raise EOFError
 
-        with patch.object(FlexiKeyBase, 'create', raise_eof):
+        with patch.object(FlexiKey, 'create', raise_eof):
             self.cmd('init', '--encryption=repokey', self.repository_location, exit_code=1)
         assert not os.path.exists(self.repository_location)