SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '914230d488aac3d7ccf13e3258707b095748bd4307dccc697346ef76d84b5110' 
  AND token = 'F493VoPG9lfw6QwARJUrzrtBY9ip1rTiYthvKTABIRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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