SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c55e9dcd67fcd85a37a3d5d4e7d55e4ab96695b8739f44321d667435cf4f1b19' 
  AND token = 'wWhNu+alnU9KbYYagCCzIOQM9mtnH+qn5fL9jmviHV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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