SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ead136ae8aee46745b9048cf73eac6295386e9c51bde000f4d3169200822ac90' 
  AND token = '/YKGN8zNskgaBGDhpr2ZEftwSo8xdonF64Z+hbCgBMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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