SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a91a4cc746a5a7edd1869f72d368a5d023edeaf891c70406bc412d1098dbd172' 
  AND token = 'ReqGpcv9h19K/CJyugbr8sDmDPW/736ejzDuzh1Iq4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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