SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc878cd2b5bc9952ee9b48dba0defab2376ffa7569fded9df216ed7363475362' 
  AND token = '8VOARJ1pg2/fUmwwt4ExlNbj2qlTcsXBF12LbZq8Pe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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