SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b913a8f0b3c07c0cb715d49709824d76ed24b6be3f70511072d88af253778e6' 
  AND token = '9jMJJwYi6Dl+pV5N2l6lDQLrWAAXelspgj7hnJk/Dvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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