SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66a5bcacd984f38d77e9e85903834092579959cecd16ba27f293dcd40b01512d' 
  AND token = 'iCal/xcYEGPjjg4wKUQvv3BhHids1L7IsSaSlBjW5t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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