SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9722d07994871f0cc35fcf33ad40efd9f37f9db3a82252b6d04fc638a04a9e5a' 
  AND token = '1I9MqDPlymFZQYOz2bcwbtS6Yrzs9JphRJx0fTnV+0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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