SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c2328be4d7e351b56097bcb90f0a44d0ffd076c4a75559f98fa2e287c626d1c' 
  AND token = 'jtd4qXMddQxh84/4Sq3PrChBPbhgKvvGIrnHuN7YCug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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