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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6c8974540cebba71dd9ff064ede9a457bd68e58a4406d8e23802c25e193f365' 
  AND token = 'KdeZPLe46bFGanaNwntUbmz6IkbD8V67r6oWNWsCw8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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