Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa747a597bdd0253a6a2b40a6aab12b8d1bbc8c4ac63cd66a8e4c27e65d98495' 
  AND token = '0I8/uFPe6+D1d9+KJyYZZaFVffmy4ULMPHeKxE4ppaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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