SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4641b9a7499fb19f4c0dfd8a4dfd4c6bb39c45533b88494670fe8786980a1d6a' 
  AND token = 'jP/s60ox5udxdnQhinkB52TjV4HX+gWytztqxbZFuCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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