SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad45152d9fa122bd94dde80890199bf78a507ffde3b2d22243472e85663c5359' 
  AND token = 'PZ3uX8954GQ/VxZ+H93mf+U7rG6L4/3/Y5swn8DspfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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