SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15324058d7b7ddfb16977a6d2ab7e1a35c0c3f98f06f6c964bd5b73a1126480e' 
  AND token = 't5PTGsph9s7+UcOWEXy/T4WYnslJCtXrxUJLwk/gcNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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