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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1cd99133e7a6ff52c014db95d195c8d12d43771d3ff754fdc1cd5f7e5fbed9c' 
  AND token = 'IvZhviy9TADwg8XyPqA/88HYFn0/N1AcGaMxp3MrSWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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