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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '191adbf8b5fc08cf06fea473ccc8d2bedc78b6ed620d0860842174a81953c18d' 
  AND token = 'LWVeQ91AWItfxbdWWY0DdZcu1tif4DDXlN6ZADlkpmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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