Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6007d9b6ba6a9ba866d5a65e5195dd2c33e1e98af2d78ccc3a352c9cd57d4385' 
  AND token = 'Dmtr1gNSfHbI77LpmVa1ayMtRjaxSdYGsK9o9w/FYQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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