### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
}
    private ApiKeyDoc buildApiKeyDoc(char[] hash, long expirationTime, boolean invalidated, String name) throws IOException {
        return buildApiKeyDoc(hash, expirationTime, invalidated, name, 0);
    }
    private ApiKeyDoc buildApiKeyDoc(char[] hash, long expirationTime, boolean invalidated, String name, int version) throws IOException {
        final BytesReference metadataBytes = XContentTestUtils.convertToXContent(ApiKeyTests.randomMetadata(), XContentType.JSON);
        return new ApiKeyDoc(
            "api_key",
            randomBoolean() ? randomFrom(ApiKey.Type.values()) : null,
            Clock.systemUTC().instant().toEpochMilli(),
            expirationTime,
            invalidated,
            new String(hash),
            name,
            version,
            new BytesArray("{\"a role\": {\"cluster\": [\"all\"]}}"),
            new BytesArray("{\"limited role\": {\"cluster\": [\"all\"]}}"),
            Map.of(
                "principal",
                "test_user",
                "full_name",
                "test user",
                "email",
                "test@user.com",
                "realm",
                "realm1",
                "realm_type",
                "realm_type1",
                "metadata",
                Map.of()