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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '845c10ee8d3ade453b2b9a08a5701bd96fb594c9c78cef807695075dc375fa71' 
  AND token = 'Tkz870U0kAvDEuIhZEwHZxmvLobQx4tlY9SXiQJy6hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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