SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd34118f0ccd07aedb9246291ec0356d551cc7281c8af1f3800abc8a96c765f3' 
  AND token = 'IgAIzzhTMlqsG8AF6QgYanMjVUQSMn3z8xyHsumJjKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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