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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5eaa85fd3091b7f2bd9e23f5b16bfb9af0a3ddd46e17253d6dfe0a495ed71aec' 
  AND token = 'AgFL/OW/u7hVWf1L3PSdYAPekAr2HYQFYV/7JAKFljg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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