Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1266bbc617d54cf28cea3e02a99a0b0b7bb3bd6ec275a210d1a9cb55c893497f' 
  AND token = 'SfOU/vQRpFnqJwAvFU/bj+2FdXtN+4BEeFIp2iA1Vec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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