SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0045ceaf70818e7bc36e52c48f24b9b9883f58a7370fc83faf8052fc81a92753' 
  AND token = 'Js9bbUcBKho/7maqO4xwYWGwt6FmuI/LUppIsZtSU34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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