Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b3cf50aa3278ba4b0133e08993c9b5a9a3626dc5d5636fb3bcbbcd7bd4cf578' 
  AND token = '7AKjqnnr5s+bfSxdGHiWowJs1in7Q0rz6FhjzN30j84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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