SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cce74ff3af018342ff7a7c2b11d760144be4e76d62f30bb4d31825003748469b' 
  AND token = 'wiNeCpTBBJWs5gkiDb8xP5ibhIgzxGJi2NZHWw5ZhCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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