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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c5edff6a266783efd5307c636b27bb54c788214ac187656cc1b28d083df8510' 
  AND token = 'kn7dCqk0yaja28LQjC8aMKcO781uHkRih1CWUuYNER8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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