### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
assert false : message;
                throw new IllegalArgumentException(message);
            }
            final RealmDomain domain = effectiveSubjectRealm.getDomain();
            if (domain != null) {
                return domain.realms().stream().map(RealmConfig.RealmIdentifier::getName).toArray(String[]::new);
            } else {
                return new String[] { effectiveSubjectRealm.getName() };
            }
        }
    }
    /**
     * Returns realm type of the owner user of an API key if the effective user is an API Key.
     * If the effective user is not an API key, it just returns the source realm type.
     *
     * @param authentication {@link Authentication}
     * @return realm type
     */
    public static String getCreatorRealmType(final Authentication authentication) {
        if (authentication.isApiKey()) {
            return (String) authentication.getEffectiveSubject().getMetadata().get(AuthenticationField.API_KEY_CREATOR_REALM_TYPE);
        } else {
            
            
            if (authentication.isFailedRunAs()) {
                return authentication.getAuthenticatingSubject().getRealm().getType();
            } else {
                return authentication.getEffectiveSubject().getRealm().getType();
            }
        }