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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2837096aa8d1fdf6f40c06dea123eaf092133041d3ff30d7e0ee216f729729b' 
  AND token = 'McXiC9THokhQGlhdX1s101KuOpdx3BxHsW8BmZIzpZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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