### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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 Authentication authentication,
        final BaseUpdateApiKeyRequest request,
        final Set<RoleDescriptor> userRoleDescriptors
    ) throws IOException {
        if (logger.isTraceEnabled()) {
            logger.trace(
                "Building index request for update of API key doc [{}] with seqNo [{}] and primaryTerm [{}]",
                currentVersionedDoc.id(),
                currentVersionedDoc.seqNo(),
                currentVersionedDoc.primaryTerm()
            );
        }
        final var targetDocVersion = clusterService.state().nodes().getMinNodeVersion();
        final var currentDocVersion = Version.fromId(currentVersionedDoc.doc().version);
        assert currentDocVersion.onOrBefore(targetDocVersion) : "current API key doc version must be on or before target version";
        if (logger.isDebugEnabled() && currentDocVersion.before(targetDocVersion)) {
            logger.debug(
                "API key update for [{}] will update version from [{}] to [{}]",
                currentVersionedDoc.id(),
                currentDocVersion,
                targetDocVersion
            );
        }
        final XContentBuilder builder = maybeBuildUpdatedDocument(
            currentVersionedDoc.id(),
            currentVersionedDoc.doc(),
            targetDocVersion,
            authentication,
            request,
            userRoleDescriptors