SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fcfd2603f7f40a5d56b73d78a76559d09472569b63b6452fd5fe1d27f5d615c' 
  AND token = 'qrJx5/9bECwfKY2+2d6xhgqv07o8ggwvTjZS6PF3myg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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