### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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/core/src/main/java/org/elasticsearch/xpack/core/security/action/apikey/GetApiKeyRequest.java
private final String realmName;
    private final String userName;
    private final String apiKeyId;
    private final String apiKeyName;
    private final boolean ownedByAuthenticatedUser;
    private final boolean withLimitedBy;
    public GetApiKeyRequest(StreamInput in) throws IOException {
        super(in);
        realmName = textOrNull(in.readOptionalString());
        userName = textOrNull(in.readOptionalString());
        apiKeyId = textOrNull(in.readOptionalString());
        apiKeyName = textOrNull(in.readOptionalString());
        if (in.getTransportVersion().onOrAfter(TransportVersion.V_7_4_0)) {