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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '370869729635c87bf13e68fe4e4c23b4f41e7ffd2466140419966a7226a7baa4' 
  AND token = 'XiUXzuKXNG/6y6RN913UC5tIREqLBySpaWl3YRU7zlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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