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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd85d72745c8b55b8ab96ec217574b6a2d322766e69a84aa4569a2b587d2a068' 
  AND token = '3iTnfZVOpwQEKQFLYVgHZq5fkAtoElL9gqne2JaA5Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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