SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c08afdb1a80c756a7c7697ab146b998372e1c3ff3f02dc1af9b28f09b765ea5' 
  AND token = 'rQeThqMOHnGs91mRSVmb4L/A6x4xS+6FvthWpYGOTXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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