### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
}));
    }
    private static Instant getApiKeyExpiration(Instant now, AbstractCreateApiKeyRequest request) {
        if (request.getExpiration() != null) {
            return now.plusSeconds(request.getExpiration().getSeconds());
        } else {
            return null;
        }
    }
    private boolean isEnabled() {
        return enabled;
    }
    public void ensureEnabled() {
        if (enabled == false) {
            throw new FeatureNotEnabledException(Feature.API_KEY_SERVICE, "api keys are not enabled");
        }
    }
    public void crossClusterApiKeyUsageStats(ActionListener<Map<String, Object>> listener) {
        if (false == isEnabled()) {
            listener.onResponse(Map.of());
            return;
        }
        final SecurityIndexManager frozenSecurityIndex = securityIndex.freeze();
        if (frozenSecurityIndex.indexExists() == false) {
            logger.debug("security index does not exist");
            listener.onResponse(Map.of("total", 0, "ccs", 0, "ccr", 0, "ccs_ccr", 0));
        } else if (frozenSecurityIndex.isAvailable() == false) {
            listener.onFailure(frozenSecurityIndex.getUnavailableReason());
        } else {
            final BoolQueryBuilder boolQuery = QueryBuilders.boolQuery()