SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c36a0667e4d61c0facd519a6006be8be586c718b06ee42d61c7aa9ad167f4a2' 
  AND token = 'ES9/+nbVdLGkVvhf+EOQ4YxtzLVCgT8T8XwzPY+H+jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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