SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '743d80917fb7f43b30cb1273f89590b77799b684f976c695bfb771c43d4e613f' 
  AND token = 'mJYYhUsXhjbb/CCH9zjIGq1l4VH/UdNoFHD7gJwWy9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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