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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cc0587dfb2d53e21befab7c7a55f61dd8b434b6a32f65566659a9d44c599306' 
  AND token = 'zdtYaeMRj211JvJTJ1VZ1GhNyFTX55iS925zCy7a3T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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