SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bccca4c25458110ce239bd1a0c0ef1ee72d6a490812650c9c996f2baf7d98bb2' 
  AND token = 'Nh1Ex/jWBtnXou8ZK+3jOYFvEz90y2CnsMyKB9nyGUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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