SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fb70f786b056d9b80dd720690b5c913f5b120c4fecf0cc747803ec6a3eb7bac' 
  AND token = 'DCm8QvvqtIh+sqBcPpZNpNw97t2v48kqu8OZxGtUYgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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