SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0264342e549b354b95cfd09c7a4d2570719ab600797c9de3436e20bd484be2c9' 
  AND token = '+0q0s2FcZJzs3owzzx9aV+gL12MHmXjiQB1hBPp0HVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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