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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0a55eba38c73d33277efff009ba968e1a1c2375eaf02837eb5cfa8c4be0cd35' 
  AND token = 'sB/JS9yBp4QjB874U06oKZSbDCAxWMaar4pZkGl833Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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