SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d81f393305f57febc79814bc462fba1de9f2786214699c35a9c5fd25ce4ec43' 
  AND token = 'J7MfgVxYHQhljiPUckdgCMLXJhN/jKXTqeOsnS3XgGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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