SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f73baa80f4153495b203ab97d916546e9ded393b93868c56a5f52cd7370f91c' 
  AND token = 'M0YAeXqWjCJ2SLD+9YMGFM1Yh4CjAu0d/RSjBNLWlyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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