SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93292c45e5558dca69da6d064e0d3c5bf60f5531f99f7d0772c0a65da4cb5122' 
  AND token = '+CCSnLvBaTlz/fLVOR4wxCa7bqFGHHwCbDBTY7QcITk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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