SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3af7ae7f9ba3fc5c741f87b4a4a905f15136d7bf5c7d66c87f99a623efa39338' 
  AND token = '2BlLAj7GMHcJ9FF9Zl0VJ8hHPoO08b8ROU7wDC7KwUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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