### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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 {
                    logger.trace(() -> "Failure in [" + action + "]", esEx);
                }
            } else {
                logger.trace(() -> "Failure in [" + action + "]", exception);
            }
        }
        return exception;
    }
    
    boolean isExpirationInProgress() {
        return inactiveApiKeysRemover.isExpirationInProgress();
    }
    
    long lastTimeWhenApiKeysRemoverWasTriggered() {
        return lastExpirationRunMs;
    }
    private void maybeStartApiKeyRemover() {
        if (securityIndex.isAvailable()) {
            if (client.threadPool().relativeTimeInMillis() - lastExpirationRunMs > deleteInterval.getMillis()) {
                inactiveApiKeysRemover.submit(client.threadPool());
                lastExpirationRunMs = client.threadPool().relativeTimeInMillis();
            }
        }
    }
    /**
     * Get API key information for given realm, user, API key name and id combination
     * @param realmNames realm names
     * @param username user name
     * @param apiKeyName API key name