SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0be5165ecdc7e201c0334336c6a02b1a7b6e12f079fa71eb3d66f09428fb861' 
  AND token = 'MSz/gY6IzJtkQms0TPX45Tos+Fgz75/40CQkvARpLwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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