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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91df90acd1fa1c96469e0a70b120c0cacef8e4761bf2b48dcb0c600fa0e74ee1' 
  AND token = 'H25L3EvSmhCX4KGTfOkHzkSQisH6qV5/w+9qpfFSe2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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