SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25c4477585b8a5c84eac8cd0c87e0631da5421ebc5dff547d3f7b0e568993f66' 
  AND token = 'no9q7SKGc3bdjg3mhfMGpCe2asZVFWYxv+o4hkMaWgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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