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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca451958e11eb88cc8037a0272ab8a93e2eadf446e9875d4550cdddd8ba7bfa4' 
  AND token = 'l6uxTV+b+Fg0ai2q8kUxswnCXd9Zd+uXmuV3OZTn3U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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