SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '037c8cd985d49c00c5c8093f32a3fdffb75f9f4d79ed4ff3ad289e89605b84f1' 
  AND token = 'FO66udVzz9/R6kQWYNBjJ6mbLDdwuDLk9zyywK0PLPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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