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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91b87493b7ab53aa8f04fdb4781e5cf9f0c1e8a9cb93709bb6944f409b9439be' 
  AND token = 'e5Bh0QSsoxUqeD9D6qDl3D5O4fxn2ofkzEzlolWzlxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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