SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62ac78d708f502ce79b62e5a99dbe4d6fbb60872fdc4899d90747101933ea0f7' 
  AND token = 'XWsZvTVU1tOoKniE8tj5dkNM0HYEdojhGJfrgMhk/UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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