SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3efe97a065d5e82446d56f3c268e6803538452861b1129588254a57f78305953' 
  AND token = 'u7TLULXQ1FVg6uuGQuEOK2cgEvszqw5WXrQV21/ZthM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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