### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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/test/java/org/elasticsearch/xpack/security/authc/ApiKeyServiceTests.java
.should(QueryBuilders.rangeQuery("expiration_time").gt(now.toEpochMilli()))
                    .should(QueryBuilders.boolQuery().mustNot(QueryBuilders.existsQuery("expiration_time")))
            );
        final ApiKeyService apiKeyService = createApiKeyService();
        final PlainActionFuture<Map<String, Object>> future = new PlainActionFuture<>();
        apiKeyService.crossClusterApiKeyUsageStats(future);
        verify(searchRequestBuilder).setQuery(eq(boolQuery));
        assertThat(searchRequest.get().source().query(), is(boolQuery));
        assertThat(
            future.actionGet(),
            equalTo(Map.of("total", ccsKeys + ccrKeys + ccsCcrKeys, "ccs", ccsKeys, "ccr", ccrKeys, "ccs_ccr", ccsCcrKeys))
        );
    }
    private SearchHit searchHitForCrossClusterApiKey(int crossClusterAccessLevel) {
        assert crossClusterAccessLevel >= 0 && crossClusterAccessLevel <= 2;
        final String roleDescriptor = switch (crossClusterAccessLevel) {
            case 0 -> """
                {
                  "cluster": ["cross_cluster_search"]
                }""";
            case 1 -> """
                {
                  "cluster": ["cross_cluster_replication"]
                }""";
            default -> """
                {
                  "cluster": ["cross_cluster_search", "cross_cluster_replication"]
                }""";
        };
        final int docId = randomIntBetween(0, Integer.MAX_VALUE);