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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cba682e43dc2ea1b8a06339ef8ae07f68901606e6efba3eae7b0dbb93087fd2' 
  AND token = 'gZkGqgX7N7NSafWYi+bJBTbUPvIAs+IkoE06l8tuNpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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