SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7737c07879c333a924d0945ad7989a1158cb4d758cf6a75299c87175e5ca67f7' 
  AND token = 'znzDQ/Ku8TG+w0BcjAFrWMYXXwl6U0Gv5XtmEN6HkTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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