SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '822f9d0758b41a2b8234678a2b92eda9fe44f67d4d249de6f8d6c143ffb615bf' 
  AND token = 'Q66vd99woeChAH/WfrdleBJFBPXKL3Uq9zPzHip0TBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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