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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '030b37b7ca3444ff7c455cd336db3f49e3619825b8e621fe2176f2dfefd2f496' 
  AND token = 'W7UsjR8NPUt0FUbLlzKnV11kr4A7WJsx7F2QM7IOrvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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