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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e68a43c60a3b81a39e4a1603d8f93fcfdbe205a4d439e02d582e32a9945b8d0f' 
  AND token = 'dCu4kUo1wNNOdIjapLNYzBLpc0diTT9/MdU+6Ndvd8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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