SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64d7ab233d510962a166527068bb0d46315f46f92f2e3a1d93a40f557cc18dba' 
  AND token = 'IcZO8mqrXeGODKfmfKSPLk+cFNYfljGtdmsKHBq1LUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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