SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb5e073ab179662303ce3c09415012f62436bede08f390eedacbfd0d1eb91e87' 
  AND token = 'dBg0MLsYZbz9qswVhzSbtm1mz9w8ugRBcLuT4lZlGYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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