SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71916d34b22394ae6ee12a1437d9589eeba5e3d01e71a88fe8a57d58f055730c' 
  AND token = 'L6ZsuwHsBK+SH/pHVzIu8i1O/Iuv0tO2qjzJBonl5hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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