SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fab354996efeb4a5869be5a631eb2607fd7e61040f6213225a95d91f7f308a75' 
  AND token = 'Aoov8QY6d+AzGc1EK0YLr7JDXAHy2xz7hAGNngYv5Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}