SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb4e837f63bf51c4c9b9c79a81bd78433faf6f1d08b207e4554289641f543726' 
  AND token = 'HpDyFhzKRHvi28S3n6WUUAJRbQ4tgCkXaKUdwrmzNUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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