SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d320fe74891b68bf71be531b54f532ba40dc30f9dda00d461e1c0a91d77aab6' 
  AND token = 'zxqXP+Enaz6qJMDYg6daPpOun/EYtdRMywKhJz7OUmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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