SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48f4db79465933d9fa40d58821f45d3084c55f3eaa7056475ed834f89e498789' 
  AND token = 'LTVvwNpBKQJCnaksqtbHbKjrZXK70t6V9Nan0Dtkz+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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