SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee0882511bd36a23d2dcab6d0eb8749df4008f288356c9a4e3205cd9c9ec7a46' 
  AND token = 'l4CsY53VW5XwmRFL/A4AVVphgKPqVuUXdl7f/aE8zfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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