SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dd33da9300dc53a5eabb1cef38b73e6856b2289246b62316155b282ce14fa41' 
  AND token = 'EJI/7J6ZGs3Xw4n6dkGN9Y/IpYKXPAzn0YFaBD9YtNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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