SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '598f4ba52a0a6b7a7c3a633845de37c419e65a6d182c46f52eb9e0b9cb29ee64' 
  AND token = 'xHyCNBYjf7Wfwq4L8ialVRNuUnv+obkj1mAiOCQV3j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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