SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30cf4eb1e5d2e0890739447f0cdf0fa069d0fe239b24a85c26503dac915564be' 
  AND token = 'dUVIOjy8UxxP06xUxmfr3FianOLGJ+ZqLAGY+/otavs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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