SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a9dda7ec07349c0e8d324df5f3476fd06b872730d7b9476b11205958ae091f4' 
  AND token = 'WForG/nCO9xOMcHC3y+WwvSNgYV67Nnu47KuF5ssJmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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