### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
}
    /**
     * If the authentication has type of api_key, returns the metadata associated to the
     * API key.
     * @param authentication {@link Authentication}
     * @return A map for the metadata or an empty map if no metadata is found.
     */
    public static Map<String, Object> getApiKeyMetadata(Authentication authentication) {
        if (false == authentication.isAuthenticatedAsApiKey()) {
            throw new IllegalArgumentException(
                "authentication realm must be ["
                    + AuthenticationField.API_KEY_REALM_TYPE
                    + "], got ["
                    + authentication.getEffectiveSubject().getRealm().getType()
                    + "]"
            );
        }
        final Object apiKeyMetadata = authentication.getEffectiveSubject().getMetadata().get(AuthenticationField.API_KEY_METADATA_KEY);
        if (apiKeyMetadata != null) {
            final Tuple<XContentType, Map<String, Object>> tuple = XContentHelper.convertToMap(
                (BytesReference) apiKeyMetadata,
                false,
                XContentType.JSON
            );
            return tuple.v2();
        } else {
            return Map.of();
        }
    }
    final class CachedApiKeyHashResult {