SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0798e20d8e3cd455a65c6ac5f9185096a3be3e344fbc288f0304c555ce422c8' 
  AND token = 'PeF1XZx57sQNYvzAOfzTjnVs2qdIKM9lwAJfE32gQPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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