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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b96285e7dc6be9e87142320a4af6b187c98e143ba200f70a32ff5b04c823c85f' 
  AND token = 'myeppEzFV4KnETh+sbLWcvmv3lU0cZNJX4I0TiOo85c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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