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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ced9dea496a10942a641a6aa43afd3646a4f1c6d3c3ea72b7967572c2c996c94' 
  AND token = 'aMguAop2QGJM6Ri3TcmsljIeHkZxA7PfV/Nj/6ZeO5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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