### Description

The [Get API key information API](https://www.elastic.co/guide/en/elasticsearch/reference/master/security-api-get-api-key.html) can currently filter the returned keys by:
 * key id/name
 * keys owned by the calling user
 * keys owned by other users, by `realm_name` and `username`

Irrespective of the filtering used, both invalidated and expired (but not yet deleted) keys will be included in the response.
In the response, keys have the `invalidated` boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.

I propose we introduce a way for the API to support retrieving:
* only valid API keys (not return invalidated keys) - using a boolean request parameter
* keys not expired before a certain timestamp - using a timestamp parameter that defaults to "now" - also note that keys' experiation date is always checked against the local node's clock
x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/authc/ApiKeyService.java
);
                        } else {
                            apiKeyAuthCache.invalidate(credentials.getId(), listenableCacheEntry);
                            validateApiKeyCredentials(docId, apiKeyDoc, credentials, clock, listener);
                        }
                    }, listener::onFailure), threadPool.generic(), threadPool.getThreadContext());
                } else {
                    verifyKeyAgainstHash(apiKeyDoc.hash, credentials, ActionListener.wrap(verified -> {
                        listenableCacheEntry.onResponse(new CachedApiKeyHashResult(verified, credentials.getKey()));
                        if (verified) {
                            
                            validateApiKeyTypeAndExpiration(apiKeyDoc, credentials, clock, listener);
                        } else {
                            listener.onResponse(
                                AuthenticationResult.unsuccessful("invalid credentials for API key [" + credentials.getId() + "]", null)
                            );
                        }
                    }, listener::onFailure));
                }
            } else {
                verifyKeyAgainstHash(apiKeyDoc.hash, credentials, ActionListener.wrap(verified -> {
                    if (verified) {
                        
                        validateApiKeyTypeAndExpiration(apiKeyDoc, credentials, clock, listener);
                    } else {
                        listener.onResponse(
                            AuthenticationResult.unsuccessful("invalid credentials for API key [" + credentials.getId() + "]", null)
                        );
                    }
                }, listener::onFailure));