SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5187a85fe89188d9524f96f9370c35027424e1186ab0aa7024efe23cddcd52a2' 
  AND token = 'lSnsGfbnIZzjMXrswBLY8XRSQCpquq2p19uoN/9U8yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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