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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '777f12568f81dfcf2f3a6d175d46cbc19ce401d5ab6e0aff350814e33bb2a0fe' 
  AND token = '5juRU+qq27YiOa0WBrnwbvcoyd3dJaOwYWXk3yHdlzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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