SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '745c0381975de27d01965616f0258fba96e49f820bf314aa865348f8d66ec151' 
  AND token = 'mcRK4kiTheAY9KODCvps+jQMO2HQGyfSgzoiiihC0Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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