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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4d56c155944c5f63be56aec7e73d307cdf3d58a353509a31f34f7dfd53efae0' 
  AND token = 'Yf3o29Z8D4FmogvO5Eql9JFAZ1oW4Rdzvx8kY6GMaek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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