SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e935d422901b889c449c514cd29b6b5134ca09e3a325f928e26c8182e7e1591' 
  AND token = 'h02yGXgGw3N7XCyrvXmBpnIKUiS8zG85Zq9xyL6fRDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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