### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
}
    public void testGetCredentialsFromThreadContext() {
        final ApiKeyService apiKeyService = createApiKeyService();
        ThreadContext threadContext = threadPool.getThreadContext();
        assertNull(apiKeyService.getCredentialsFromThreadContext(threadContext));
        final String apiKeyAuthScheme = randomFrom("apikey", "apiKey", "ApiKey", "APikey", "APIKEY");
        final String id = randomAlphaOfLength(12);
        final String key = randomAlphaOfLength(16);
        String headerValue = apiKeyAuthScheme + " " + Base64.getEncoder().encodeToString((id + ":" + key).getBytes(StandardCharsets.UTF_8));
        try (ThreadContext.StoredContext ignore = threadContext.stashContext()) {
            threadContext.putHeader("Authorization", headerValue);
            ApiKeyService.ApiKeyCredentials creds = apiKeyService.getCredentialsFromThreadContext(threadContext);
            assertNotNull(creds);
            assertEquals(id, creds.getId());
            assertEquals(key, creds.getKey().toString());
        }
        
        headerValue = apiKeyAuthScheme + Base64.getEncoder().encodeToString((id + ":" + key).getBytes(StandardCharsets.UTF_8));
        try (ThreadContext.StoredContext ignore = threadContext.stashContext()) {
            threadContext.putHeader("Authorization", headerValue);
            ApiKeyService.ApiKeyCredentials creds = apiKeyService.getCredentialsFromThreadContext(threadContext);
            assertNull(creds);
        }
        
        headerValue = apiKeyAuthScheme + " " + Base64.getEncoder().encodeToString((id + key).getBytes(StandardCharsets.UTF_8));
        try (ThreadContext.StoredContext ignore = threadContext.stashContext()) {
            threadContext.putHeader("Authorization", headerValue);
            IllegalArgumentException e = expectThrows(
                IllegalArgumentException.class,
                () -> apiKeyService.getCredentialsFromThreadContext(threadContext)