Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7947f8ca51bdee10dd108c83a2fa54e93bf43a930471871735da77ce822d593' 
  AND token = 'On5tGT/VAAqFmcG4acdSgAS0DsQgZ0J0GD/geER2/lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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