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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36c3d3dc5f1e4c56f83f763e341f836a87bd7eabeb31a8fd355238f46bf2ff27' 
  AND token = 'P+yD2jngWOe3JlaSKkPiT0qG1Vk0t8QwbFC46hzq0a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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