SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f203365bb7a3caed1ee41ba217e808bb48eec7c1c34e64359a284416b705f6d' 
  AND token = 'ljQWz4rrEF7TnZKhAlHl8/RPQFJmxSExzlgJK7meOYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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