SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c49bada647469f4d13c8fbb1f5f89b502820517327926ddd3462a76b4a1eeba' 
  AND token = 'O9qG988PwzP+GYci+qyyzVBQIOBeQSk2C5Srq8p/Fzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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