SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdf5f84348840846c8226aa11b596e26365df5c8e74fa6a77d98a4edcf2201e6' 
  AND token = 'zz3kqa+RiXZ0esGCNdUJh89BJk7lvsnsGD5BfvyTW6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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