SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0099933b4d7594e6b5ae58e368f491c25401e158174de30674630258a46b61d' 
  AND token = '9Jhn8DCiwlORBUqyJXDXWxFaXdRoO/5GWEmggoNS70A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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