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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b28cefa1bc3995deebf56f3bf2aac8e9052d23afb9ad35b0717ba43824beab5e' 
  AND token = '5wnmfGh3stSHaocoQB6oFdKpSDZRQVKascl1Qj5ZDpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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