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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd795fb9eb7e111d234bf7186b2ee34104114c2d78d8004b57b61e299b9afb2ea' 
  AND token = 'q94hL8/HTODicDLM5v84lqxjOSeOy5prW4PqOfhodwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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