SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cce4f8824ba6642091117b2687f3063120e3fac9c0de53dc7374cb2c7ba7b8e' 
  AND token = 'ek2AZkjgKPjCZcg/4k3UHJVBC5n9lF/XVJiIlUZGt2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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