SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d17224fb4eff7386ce0c28d658afa2c759f217e5d4049b09f60b392e52134b1' 
  AND token = 'wSPp61B2lkUblKeZjHX8e2hx1MD4AKxxTU/n/BZYrCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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