SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '792432497c7d327bd08fffd1e25bae48f2403d899b9a36fe1d978ed26b82ddb8' 
  AND token = '1tSu3iD9kecLe87K3/ObhbJlKZznm8gxjhlVfp65QvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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