SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6c4f79975372544118fd62f871679d8684cfa47a2909b2a61466528bf0e9ddc' 
  AND token = 'lnYLufVJYdVod9xVUGSc65ICkKFUCPha1Z9lu5qBjiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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