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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49db817782eb369005393999b880dfbdacf4edbaaae3f8ee659e91f8a476dbdc' 
  AND token = 'oxTK++0F8qtdXFz2oZOsBSJ4BVw25SAruDpBaBj96f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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