SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67da8c331d272959da42fbdd6be4f8569e42c09b0342718f5e7e3ad7c6876688' 
  AND token = '4CBiEdsg5bnoLGB5MVcn2+P24oT/zIO/cFXXD5hrkEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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