SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1098496ef3bc46602ef3fb5542d5ce16bd96c800085940d9712787f1b5ff52a5' 
  AND token = '1GY6bISx+U7QCVVyBAcGdIfpHFVZ2U4zQGm1WeK3Qzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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