Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78e6703e6a2e4e9bf1edca346bcc241ef4a66e9903d02dc73de7c4ba08934048' 
  AND token = 'P3aLpQ5bhG5ewY4JRTbLp2b+ZSOIyuFGE/r9QhsVMDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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