SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd594c0ea7bae3f452363afb706c6e9c4e792e3b823897ffff45833de0660628' 
  AND token = 'GKjJl01g79qpMxudI+NUDDM4qzsRzdVdHVPQ4la4tJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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