SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a59837e1f912eba4ffd5e5755e74176ab400e6eb4cd3f5f522001df2131f87d6' 
  AND token = 'IO0gzm1LlIIQvJOWMxLM9bRdxSwGBqVX8/Bbfldq/pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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