SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29deb393746cf99850920fb64bc7e99e3c27fda4e860488ef889d2ab663ac673' 
  AND token = 'RXqVgmVBXHHA7n5BGoUBO9oSpOqOJS+XYZG2R/na+xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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