SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3168c1c9046bb67c84f9698693f05cf224a7f98f58c7c372dfdb058ece60ddc5' 
  AND token = 'CUbyiviVlqOiKXCyTZ38vG5w/V+9+8WeGii0u+TGVZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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