Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f5d1012c3ca0f6d3c57f8b9970366af96e9c6520c4103edfd6beea31fb014f0' 
  AND token = 'RxrTqdtGTwsAtgKsCrrsdVsH6k9BRXzqgzfmuH2LFsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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