### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
}
        final Exception workflowsValidationException = validateWorkflowsRestrictionConstraints(
            transportVersion,
            request.getRoleDescriptors(),
            userRoleDescriptors
        );
        if (workflowsValidationException != null) {
            listener.onFailure(workflowsValidationException);
            return;
        }
        final String[] apiKeyIds = request.getIds().toArray(String[]::new);
        final Set<RoleDescriptor> filteredUserRoleDescriptors = maybeRemoveRemoteIndicesPrivileges(
            userRoleDescriptors,
            transportVersion,
            apiKeyIds
        );
        if (logger.isDebugEnabled()) {
            logger.debug("Updating [{}] API keys", buildDelimitedStringWithLimit(10, apiKeyIds));
        }
        findVersionedApiKeyDocsForSubject(
            authentication,
            apiKeyIds,
            ActionListener.wrap(
                versionedDocs -> updateApiKeys(authentication, request, filteredUserRoleDescriptors, versionedDocs, listener),
                ex -> listener.onFailure(traceLog("bulk update", ex))
            )
        );
    }
    private void updateApiKeys(
        final Authentication authentication,