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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6b07780a34fa50231e59c60a7f9e3b518c4eed89cd2eb201c108ffa0e2d63d7' 
  AND token = 'HihsBVkLh9bckLCJq0BdZ1RRW/QVnN2qIW/Mk4xmEZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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