Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af97f7ccce67fe25cd6d18b11ee08cb81962d7abc1275eb8920e9a8a7e7e3e4a' 
  AND token = 'i/yXCNIdQTBIIxVsXJ5AFEKYFkXEm47FwslkWLU0NCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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