SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c0ea50708073e36a96ed5429ebc662dcfd7ae726f8df03c1d45fdc9c0923f21' 
  AND token = 'tt54Tn5getQbJuhLg54fXUOY/+z4znVw677GnsIuYAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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