SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae1f637f79c38c814cb89e1c6b92076a9981814ac81e23e32d11ca4e763f1aff' 
  AND token = 'GZzMC59qPqhPCP2QYJaObBpbSAdFV5XaVsOUHh09ElE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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