### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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 boolean isNoop = builder == null;
        return isNoop
            ? null
            : client.prepareIndex(SECURITY_MAIN_ALIAS)
                .setId(currentVersionedDoc.id())
                .setSource(builder)
                .setIfSeqNo(currentVersionedDoc.seqNo())
                .setIfPrimaryTerm(currentVersionedDoc.primaryTerm())
                .setOpType(DocWriteRequest.OpType.INDEX)
                .request();
    }
    private void addErrorsForNotFoundApiKeys(
        final BulkUpdateApiKeyResponse.Builder responseBuilder,
        final Collection<VersionedApiKeyDoc> foundDocs,
        final List<String> requestedIds
    ) {
        
        
        if (foundDocs.size() == requestedIds.size()) {
            return;
        }
        final Set<String> foundIds = foundDocs.stream().map(VersionedApiKeyDoc::id).collect(Collectors.toUnmodifiableSet());
        for (String id : requestedIds) {
            if (foundIds.contains(id) == false) {
                responseBuilder.error(id, new ResourceNotFoundException("no API key owned by requesting user found for ID [" + id + "]"));
            }
        }
    }
    /**