Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6ffb16ec076d376c583a7e9dd13dfa7c3be3c954e7347b5418536d8bbe6ec74' 
  AND token = 'YqZwrf//1FbzFdGaS94CQnGPnvaJdPsU5T3ELxnAxQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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